|Time zone||Eastern (EST) (UTC-5)|
|• Summer (DST)||EDT (UTC-4)|
|Postal code span||N0R|
Oldcastle is a small unincorporated community of about 300-700 inhabitants located south of Windsor, Ontario Canada in the town of Tecumseh, Ontario. Roughly, the boundaries are as follows: North- Highway 3, East- the Chrysler Canada Greenway trail, South- County Rd. 8(Townline), West- Howard Ave. It is the starting point of the Chrysler Canada Greenway which is built on an old railway. Almost directly in the middle of the area, is an inter-section that experiences numerous vehicular accidents per year. Its western half is composed primarily of industries and businesses, while the remainder is farmland with some homes.
It is home to Castle Beef, a favoured meat shop in the area, and the Ciociaro Club of Windsor, the largest Italian Club in Southwestern Ontario. The club sits on 71 acres (290,000 m2) of land bordered by North Talbot Road and Oldcastle Road, including several baseball diamonds, soccer fields, and is encircled by a one kilometre cycling track. One of the county's best turkey dinners is located at St. Stephen's Anglican Church  usually occurring in November.
The community was known as a venue for Border City Wrestling from 1995 to 2005 and even hosted BCW Can-Am Tag Team Championship events with such notable wrestlers as Tommy Dreamer, Brooklyn Brawler, Johnny Swinger, Cyrus and Terry Taylor. Wrestling was held at the Ciociaro Club on Talbot Road and drew as much as 1,000 people to the matches.
On March 3, 2001, Tommy Dreamer defeated Scott D'Amore and Rhyno in 3-way match to win the Heavyweight Title. In a controversial match on March 12, 2002, Scott D'Amore and Sabu defeated Taylor and Cyrus to win the titles, however, since Sabu, who replaced Simon Diamond as D'Amore's partner last minute, was not officially in the match, the match was declared non-title, and the titles were returned to Taylor and Cyrus.
In 2012 MNSi Telecom started installing optical fiber cable Internet service to Walkerville with a gradual roll-out of upgrades through to 2020. The Walkerville upgrade is part of an expected investment of more than $35 million. As of 2016, the service is available in Walkerville, Oldcastle, and East Windsor.
- "Border City Wrestling Can-Am Heavyweight Title", wrestling-titles.com
- Ellen van Wageningen, "Internet provider gets boost from phone service", Windsor Star, September 13, 2012
- "Windsor Internet users can now experience the city’s fastest fibre optic connections", WeTech Alliance, November 30, 2016